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<div class="title">nrf51/Source/spi_master/spi_master.c</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001  <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00013"></a>00013 <span class="preprocessor">#include &lt;<a class="code" href="spi__master_8h.html" title="Software controlled SPI Master driver.">spi_master.h</a>&gt;</span>
<a name="l00014"></a>00014 <span class="preprocessor">#include &quot;nrf_delay.h&quot;</span>
<a name="l00015"></a>00015 <span class="preprocessor">#include &quot;nrf_gpio.h&quot;</span>
<a name="l00016"></a>00016 <span class="preprocessor">#include &quot;common.h&quot;</span>
<a name="l00017"></a>00017 <span class="preprocessor">#include &quot;spi_master_config.h&quot;</span> <span class="comment">// This file must be in the application folder</span>
<a name="l00018"></a>00018 
<a name="l00019"></a>00019 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span>
<a name="l00025"></a>00025 <span class="keyword">static</span> <span class="keywordtype">void</span> debug_init(uint32_t *spi_base_address)
<a name="l00026"></a>00026 {
<a name="l00027"></a>00027     <span class="comment">/* Power on the PPI peripheral */</span>
<a name="l00028"></a>00028     NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_PPI_Power &lt;&lt; POWER_PERPOWER_PPI_Pos);
<a name="l00029"></a>00029 
<a name="l00030"></a>00030     <span class="comment">/* Wait for the power up */</span>
<a name="l00031"></a>00031     <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_PPI_Msk) != (POWER_PERRDY_PPI_Ready &lt;&lt; POWER_PERRDY_PPI_Pos))
<a name="l00032"></a>00032     {
<a name="l00033"></a>00033     }
<a name="l00034"></a>00034 
<a name="l00035"></a>00035     <span class="comment">/* Power on the GPIOTE peripheral */</span>
<a name="l00036"></a>00036     NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_GPIOTE_Power &lt;&lt; POWER_PERPOWER_GPIOTE_Pos);
<a name="l00037"></a>00037 
<a name="l00038"></a>00038     <span class="comment">/* Wait for the power up */</span>
<a name="l00039"></a>00039     <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_GPIOTE_Msk) != (POWER_PERRDY_GPIOTE_Ready &lt;&lt; POWER_PERRDY_GPIOTE_Pos))
<a name="l00040"></a>00040     {
<a name="l00041"></a>00041     }
<a name="l00042"></a>00042 
<a name="l00043"></a>00043     <span class="keywordflow">if</span> ( NRF_SPI0_BASE == (uint32_t)spi_base_address )
<a name="l00044"></a>00044     {
<a name="l00045"></a>00045         <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(DEBUG_EVENT_READY_PIN0);
<a name="l00046"></a>00046 
<a name="l00047"></a>00047         <span class="comment">/*lint -e{845} // A zero has been given as right argument to operator &#39;|&#39;&quot; */</span>
<a name="l00048"></a>00048         NRF_GPIOTE-&gt;CONFIG[0] = (GPIOTE_CONFIG_POLARITY_Toggle &lt;&lt; GPIOTE_CONFIG_POLARITY_Pos) |
<a name="l00049"></a>00049                                 (DEBUG_EVENT_READY_PIN0 &lt;&lt; GPIOTE_CONFIG_PSEL_Pos) |
<a name="l00050"></a>00050                                 (GPIOTE_CONFIG_MODE_Task &lt;&lt; GPIOTE_CONFIG_MODE_Pos);
<a name="l00051"></a>00051 
<a name="l00052"></a>00052         NRF_PPI-&gt;CH0_EEP = (uint32_t)&amp;(((NRF_SPI_Type *)spi_base_address)-&gt;EVENTS_READY);
<a name="l00053"></a>00053         NRF_PPI-&gt;CH0_TEP = (uint32_t)&amp;NRF_GPIOTE-&gt;TASKS_OUT[0];
<a name="l00054"></a>00054         NRF_PPI-&gt;CHEN |= (PPI_CHEN_CH0_Enabled &lt;&lt; PPI_CHEN_CH0_Pos);
<a name="l00055"></a>00055     }
<a name="l00056"></a>00056 
<a name="l00057"></a>00057     <span class="keywordflow">if</span> ( NRF_SPI1_BASE == (uint32_t)spi_base_address )
<a name="l00058"></a>00058     {
<a name="l00059"></a>00059         <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(DEBUG_EVENT_READY_PIN1);
<a name="l00060"></a>00060 
<a name="l00061"></a>00061         <span class="comment">/*lint -e{845} // A zero has been given as right argument to operator &#39;|&#39;&quot; */</span>
<a name="l00062"></a>00062         NRF_GPIOTE-&gt;CONFIG[1] = (GPIOTE_CONFIG_POLARITY_Toggle &lt;&lt; GPIOTE_CONFIG_POLARITY_Pos) |
<a name="l00063"></a>00063                                 (DEBUG_EVENT_READY_PIN1 &lt;&lt; GPIOTE_CONFIG_PSEL_Pos) |
<a name="l00064"></a>00064                                 (GPIOTE_CONFIG_MODE_Task &lt;&lt; GPIOTE_CONFIG_MODE_Pos);
<a name="l00065"></a>00065 
<a name="l00066"></a>00066         NRF_PPI-&gt;CH1_EEP = (uint32_t)&amp;(((NRF_SPI_Type *)spi_base_address)-&gt;EVENTS_READY);
<a name="l00067"></a>00067         NRF_PPI-&gt;CH1_TEP = (uint32_t)&amp;NRF_GPIOTE-&gt;TASKS_OUT[1];
<a name="l00068"></a>00068         NRF_PPI-&gt;CHEN |= (PPI_CHEN_CH1_Enabled &lt;&lt; PPI_CHEN_CH1_Pos);
<a name="l00069"></a>00069     }
<a name="l00070"></a>00070 }
<a name="l00071"></a>00071 <span class="preprocessor">#endif </span><span class="comment">/* DEBUG */</span>
<a name="l00072"></a>00072 
<a name="l00073"></a><a class="code" href="group__lib__driver__spi__master.html#gac83edc688197ced911cf822ab3eae81a">00073</a> uint32_t* <a class="code" href="group__lib__driver__spi__master.html#gac83edc688197ced911cf822ab3eae81a">spi_master_init</a>(<a class="code" href="group__lib__driver__spi__master.html#gac859abd9dbf0e642ef29753f142f4475">SPIModuleNumber</a> module_number, <a class="code" href="group__lib__driver__spi__master.html#ga96e7e9bbfca8b326307e8b20ba4706e1">SPIMode</a> mode, <span class="keywordtype">bool</span> lsb_first)
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075     <span class="comment">//const uint8_t tx_data[2] = {TEST_BYTE, TEST_BYTE};</span>
<a name="l00076"></a>00076     <span class="comment">//uint8_t rx_data[2] = {0, 0};</span>
<a name="l00077"></a>00077     uint32_t config_mode;
<a name="l00078"></a>00078 
<a name="l00079"></a>00079     NRF_SPI_Type *spi_base_address = (<a class="code" href="group__lib__driver__spi__master.html#ggac859abd9dbf0e642ef29753f142f4475a7add1e0588a075d9385b10fcbb2010f4">SPI0</a> == module_number)? NRF_SPI0 : (NRF_SPI_Type *)NRF_SPI1;
<a name="l00080"></a>00080 
<a name="l00081"></a>00081     <span class="keywordflow">if</span>(<a class="code" href="group__lib__driver__spi__master.html#ggac859abd9dbf0e642ef29753f142f4475a7add1e0588a075d9385b10fcbb2010f4">SPI0</a> == module_number)
<a name="l00082"></a>00082     {
<a name="l00083"></a>00083         <span class="comment">/* Power on the SPI0_TWI0 peripheral */</span>
<a name="l00084"></a>00084         NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_SPI0_TWI0_Power &lt;&lt; POWER_PERPOWER_SPI0_TWI0_Pos);
<a name="l00085"></a>00085 
<a name="l00086"></a>00086         <span class="comment">/* Wait for the power up */</span>
<a name="l00087"></a>00087         <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_SPI0_TWI0_Msk) != (POWER_PERRDY_SPI0_TWI0_Ready &lt;&lt; POWER_PERRDY_SPI0_TWI0_Pos))
<a name="l00088"></a>00088         {
<a name="l00089"></a>00089         }
<a name="l00090"></a>00090 
<a name="l00091"></a>00091         <span class="comment">/* Configure GPIO pins used for pselsck, pselmosi, pselmiso and pselss for SPI0 */</span>
<a name="l00092"></a>00092         <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(SPI_PSELSCK0);
<a name="l00093"></a>00093         <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(SPI_PSELMOSI0);
<a name="l00094"></a>00094         <a class="code" href="group__nrf__gpio.html#ga4e63d442ebd572126be3e030b3df4dc6" title="Configure given GPIO pin number as input with given initial value set, hiding inner details...">nrf_gpio_cfg_input</a>(SPI_PSELMISO0, <a class="code" href="group__nrf__gpio.html#gga07e0c8c0b30499cf0a7b79dbe62d3fcca13ffcb94eb78be866c66b5f5b516af65" title="Pin pullup resistor disabled.">NRF_GPIO_PIN_NOPULL</a>);
<a name="l00095"></a>00095         <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(SPI_PSELSS0);
<a name="l00096"></a>00096 
<a name="l00097"></a>00097         <span class="comment">/* Configure pins, frequency and mode */</span>
<a name="l00098"></a>00098         spi_base_address-&gt;PSELSCK  = SPI_PSELSCK0;
<a name="l00099"></a>00099         spi_base_address-&gt;PSELMOSI = SPI_PSELMOSI0;
<a name="l00100"></a>00100         spi_base_address-&gt;PSELMISO = SPI_PSELMISO0;
<a name="l00101"></a>00101         <a class="code" href="group__nrf__gpio.html#gacaf7e8e242a47f7b635bbeca5c5934a3" title="Set GPIO pin.">nrf_gpio_pin_set</a>(SPI_PSELSS0); <span class="comment">/* disable Set slave select (inactive high) */</span>
<a name="l00102"></a>00102     }
<a name="l00103"></a>00103     <span class="keywordflow">else</span>
<a name="l00104"></a>00104     {
<a name="l00105"></a>00105         <span class="comment">/* Power on the SPI1_TWI1 peripheral */</span>
<a name="l00106"></a>00106         NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_SPI1_TWI1_Power &lt;&lt; POWER_PERPOWER_SPI1_TWI1_Pos);
<a name="l00107"></a>00107 
<a name="l00108"></a>00108         <span class="comment">/* Wait for the power up */</span>
<a name="l00109"></a>00109         <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_SPI1_TWI1_Msk) != (POWER_PERRDY_SPI1_TWI1_Ready &lt;&lt; POWER_PERRDY_SPI1_TWI1_Pos))
<a name="l00110"></a>00110         {
<a name="l00111"></a>00111         }
<a name="l00112"></a>00112 
<a name="l00113"></a>00113         <span class="comment">/* Configure GPIO pins used for pselsck, pselmosi, pselmiso and pselss for SPI1*/</span>
<a name="l00114"></a>00114         <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(SPI_PSELSCK1);
<a name="l00115"></a>00115         <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(SPI_PSELMOSI1);
<a name="l00116"></a>00116         <a class="code" href="group__nrf__gpio.html#ga4e63d442ebd572126be3e030b3df4dc6" title="Configure given GPIO pin number as input with given initial value set, hiding inner details...">nrf_gpio_cfg_input</a>(SPI_PSELMISO1, <a class="code" href="group__nrf__gpio.html#gga07e0c8c0b30499cf0a7b79dbe62d3fcca13ffcb94eb78be866c66b5f5b516af65" title="Pin pullup resistor disabled.">NRF_GPIO_PIN_NOPULL</a>);
<a name="l00117"></a>00117         <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(SPI_PSELSS1);
<a name="l00118"></a>00118 
<a name="l00119"></a>00119         <span class="comment">/* Configure pins, frequency and mode */</span>
<a name="l00120"></a>00120         spi_base_address-&gt;PSELSCK  = SPI_PSELSCK1;
<a name="l00121"></a>00121         spi_base_address-&gt;PSELMOSI = SPI_PSELMOSI1;
<a name="l00122"></a>00122         spi_base_address-&gt;PSELMISO = SPI_PSELMISO1;
<a name="l00123"></a>00123         <a class="code" href="group__nrf__gpio.html#gacaf7e8e242a47f7b635bbeca5c5934a3" title="Set GPIO pin.">nrf_gpio_pin_set</a>(SPI_PSELSS1);         <span class="comment">/* disable Set slave select (inactive high) */</span>
<a name="l00124"></a>00124     }
<a name="l00125"></a>00125 
<a name="l00126"></a>00126     spi_base_address-&gt;FREQUENCY = (uint32_t) SPI_OPERATING_FREQUENCY;
<a name="l00127"></a>00127 
<a name="l00128"></a>00128     <span class="keywordflow">switch</span> (mode )
<a name="l00129"></a>00129     {
<a name="l00130"></a>00130     <span class="comment">/*lint -e845 -save // A zero has been given as right argument to operator &#39;!&#39;&quot; */</span>
<a name="l00131"></a>00131     <span class="keywordflow">case</span> <a class="code" href="group__lib__driver__spi__master.html#gga96e7e9bbfca8b326307e8b20ba4706e1aacf2eef6aadb9f0de11862660cd9ade6">SPI_MODE0</a>:
<a name="l00132"></a>00132         config_mode = (SPI_CONFIG_CPHA_Leading &lt;&lt; SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveHigh &lt;&lt; SPI_CONFIG_CPOL_Pos);
<a name="l00133"></a>00133         <span class="keywordflow">break</span>;
<a name="l00134"></a>00134     <span class="keywordflow">case</span> <a class="code" href="group__lib__driver__spi__master.html#gga96e7e9bbfca8b326307e8b20ba4706e1abd92ab028fcac05cf2ed27b4838d1590">SPI_MODE1</a>:
<a name="l00135"></a>00135         config_mode = (SPI_CONFIG_CPHA_Trailing &lt;&lt; SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveHigh &lt;&lt; SPI_CONFIG_CPOL_Pos);
<a name="l00136"></a>00136         <span class="keywordflow">break</span>;
<a name="l00137"></a>00137     <span class="keywordflow">case</span> <a class="code" href="group__lib__driver__spi__master.html#gga96e7e9bbfca8b326307e8b20ba4706e1a2607e91fc0c8ae3334284808d7f94cf5">SPI_MODE2</a>:
<a name="l00138"></a>00138         config_mode = (SPI_CONFIG_CPHA_Leading &lt;&lt; SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveLow &lt;&lt; SPI_CONFIG_CPOL_Pos);
<a name="l00139"></a>00139         <span class="keywordflow">break</span>;
<a name="l00140"></a>00140     <span class="keywordflow">case</span> <a class="code" href="group__lib__driver__spi__master.html#gga96e7e9bbfca8b326307e8b20ba4706e1ad9636eac0759655110aa77dd6c22da6c">SPI_MODE3</a>:
<a name="l00141"></a>00141         config_mode = (SPI_CONFIG_CPHA_Trailing &lt;&lt; SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveLow &lt;&lt; SPI_CONFIG_CPOL_Pos);
<a name="l00142"></a>00142         <span class="keywordflow">break</span>;
<a name="l00143"></a>00143     <span class="keywordflow">default</span>:
<a name="l00144"></a>00144         config_mode = 0;
<a name="l00145"></a>00145         <span class="keywordflow">break</span>;
<a name="l00146"></a>00146     <span class="comment">/*lint -restore */</span>
<a name="l00147"></a>00147     }
<a name="l00148"></a>00148     <span class="keywordflow">if</span> (lsb_first)
<a name="l00149"></a>00149     {
<a name="l00150"></a>00150       <span class="comment">/*lint -e{845} // A zero has been given as right argument to operator &#39;|&#39;&quot; */</span>
<a name="l00151"></a>00151       spi_base_address-&gt;CONFIG = (config_mode | (SPI_CONFIG_ORDER_LsbFirst &lt;&lt; SPI_CONFIG_ORDER_Pos));
<a name="l00152"></a>00152     }
<a name="l00153"></a>00153     <span class="keywordflow">else</span>
<a name="l00154"></a>00154     {
<a name="l00155"></a>00155       <span class="comment">/*lint -e{845} // A zero has been given as right argument to operator &#39;|&#39;&quot; */</span>
<a name="l00156"></a>00156       spi_base_address-&gt;CONFIG = (config_mode | (SPI_CONFIG_ORDER_MsbFirst &lt;&lt; SPI_CONFIG_ORDER_Pos));
<a name="l00157"></a>00157     }
<a name="l00158"></a>00158 
<a name="l00159"></a>00159     spi_base_address-&gt;EVENTS_READY = 0U;
<a name="l00160"></a>00160 
<a name="l00161"></a>00161     <span class="comment">/* Enable */</span>
<a name="l00162"></a>00162     spi_base_address-&gt;ENABLE = (SPI_ENABLE_ENABLE_Enabled &lt;&lt; SPI_ENABLE_ENABLE_Pos);
<a name="l00163"></a>00163 
<a name="l00164"></a>00164 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00165"></a>00165 <span class="preprocessor"></span>    debug_init((uint32_t *)spi_base_address);
<a name="l00166"></a>00166 <span class="preprocessor">#endif</span>
<a name="l00167"></a>00167 <span class="preprocessor"></span>
<a name="l00168"></a>00168     <span class="keywordflow">return</span> (uint32_t *)spi_base_address;
<a name="l00169"></a>00169 }
<a name="l00170"></a>00170 
<a name="l00171"></a><a class="code" href="group__lib__driver__spi__master.html#ga14655d328261ceeb3c23c73f6ae33980">00171</a> <span class="keywordtype">bool</span> <a class="code" href="group__lib__driver__spi__master.html#ga14655d328261ceeb3c23c73f6ae33980">spi_master_tx_rx</a>(uint32_t *spi_base_address, uint16_t transfer_size, <span class="keyword">const</span> uint8_t *<a class="code" href="group__spi__master__example.html#gab36e6efd0ec4bf8a1f51555850828b5a">tx_data</a>, uint8_t *<a class="code" href="group__spi__master__example.html#gae4cee0b144cc6cb01fc4c7b36e37a874">rx_data</a>)
<a name="l00172"></a>00172 {
<a name="l00173"></a>00173     uint32_t counter = 0;
<a name="l00174"></a>00174     uint16_t number_of_txd_bytes = 0;
<a name="l00175"></a>00175     uint32_t SEL_SS_PINOUT;
<a name="l00176"></a>00176     <span class="comment">/*lint -e{826} //Are too small pointer conversion */</span>
<a name="l00177"></a>00177     NRF_SPI_Type *spi_base = (NRF_SPI_Type *)spi_base_address;
<a name="l00178"></a>00178 
<a name="l00179"></a>00179     <span class="keywordflow">if</span>( (uint32_t *)NRF_SPI0 == spi_base_address)
<a name="l00180"></a>00180     {
<a name="l00181"></a>00181         SEL_SS_PINOUT = SPI_PSELSS0;
<a name="l00182"></a>00182     }
<a name="l00183"></a>00183     <span class="keywordflow">else</span>
<a name="l00184"></a>00184     {
<a name="l00185"></a>00185         SEL_SS_PINOUT = SPI_PSELSS1;
<a name="l00186"></a>00186     }
<a name="l00187"></a>00187 
<a name="l00188"></a>00188     <span class="comment">/* enable slave (slave select active low) */</span>
<a name="l00189"></a>00189     <a class="code" href="group__nrf__gpio.html#gaf3de3729249d55592c86ecfa97fb9347" title="Clear GPIO pin.">nrf_gpio_pin_clear</a>(SEL_SS_PINOUT);
<a name="l00190"></a>00190 
<a name="l00191"></a>00191     <span class="keywordflow">while</span>(number_of_txd_bytes &lt; transfer_size)
<a name="l00192"></a>00192     {
<a name="l00193"></a>00193         spi_base-&gt;TXD = (uint32_t)(tx_data[number_of_txd_bytes]);
<a name="l00194"></a>00194 
<a name="l00195"></a>00195         <span class="comment">/* Wait for the transaction complete or timeout (about 10ms - 20 ms) */</span>
<a name="l00196"></a>00196         <span class="keywordflow">while</span> ((spi_base-&gt;EVENTS_READY == 0U) &amp;&amp; (counter &lt; TIMEOUT_COUNTER))
<a name="l00197"></a>00197         {
<a name="l00198"></a>00198             counter++;
<a name="l00199"></a>00199         }
<a name="l00200"></a>00200 
<a name="l00201"></a>00201         <span class="keywordflow">if</span> (counter == TIMEOUT_COUNTER)
<a name="l00202"></a>00202         {
<a name="l00203"></a>00203             <span class="comment">/* timed out, disable slave (slave select active low) and return with error */</span>
<a name="l00204"></a>00204             <a class="code" href="group__nrf__gpio.html#gacaf7e8e242a47f7b635bbeca5c5934a3" title="Set GPIO pin.">nrf_gpio_pin_set</a>(SEL_SS_PINOUT);
<a name="l00205"></a>00205             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00206"></a>00206         }
<a name="l00207"></a>00207         <span class="keywordflow">else</span>
<a name="l00208"></a>00208         {   <span class="comment">/* clear the event to be ready to receive next messages */</span>
<a name="l00209"></a>00209             spi_base-&gt;EVENTS_READY = 0U;
<a name="l00210"></a>00210         }
<a name="l00211"></a>00211 
<a name="l00212"></a>00212         rx_data[number_of_txd_bytes] = (uint8_t)spi_base-&gt;RXD;
<a name="l00213"></a>00213         number_of_txd_bytes++;
<a name="l00214"></a>00214     };
<a name="l00215"></a>00215 
<a name="l00216"></a>00216     <span class="comment">/* disable slave (slave select active low) */</span>
<a name="l00217"></a>00217     <a class="code" href="group__nrf__gpio.html#gacaf7e8e242a47f7b635bbeca5c5934a3" title="Set GPIO pin.">nrf_gpio_pin_set</a>(SEL_SS_PINOUT);
<a name="l00218"></a>00218 
<a name="l00219"></a>00219     <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00220"></a>00220 }
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